I have no idea where you got the idea the point of the system is about injuries.
The point of the system is to penalise play which falls outside the rules of the game.
Tripping is outside the rules of the game.
Hair pulling is outside the rules of the game (contrary conduct).
The players who most recently committed these acts had a litany of charges throughout the season which rendered them unable to receive a fine for their minor charges, then with loading they were subject to a suspension.
It's pretty simple as Danish has indicated, don't be a peanut and you won't get suspended.
I agree with them all being peanuts... and agree injuries happen.
The rules of the game is also there to protect players otherwise high tackles would be allowed. I'm just trying to point out that storm tactics is systemic and planned. Pulling hair is more of a spur of the moment thing cos you cant punch - in the old days they woulda had a punch up and 10 in the bin. but to miss a finals game is a bit harsher. Tripping was a reaction thing and he barely connected - just idiotic but a penalty woulda been sufficient imho.
Yet a prowler tackle on an exposed back had the possibility of sidelining someone - there are cases of broken backs (https://www.smh.com.au/sport/nrl/la...s-past-gold-coast-titans-20160827-gr2qyu.html), pressing on someone's temples are planned - probably trained for and they get away with it... hold a bit of the jersey to mask it from pressing the temple. Whats worse is that the NRL knew about it and sent a letter rather than suspending or even fining Smith.
Just comparing how equitable the juridiciary system really is.